Polymer article and its use for controlled introduction of reagent into a fluid

• US 4,738,897 A
• Filed: 05/13/1987
• Issued: 04/19/1988
• Est. Priority Date: 02/27/1985
• Status: Expired due to Term

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Exxon Chemical Patents Inc. (Exxon Mobil Corporation)
• Inventors: Haslegrave, John A., Newlove, John C., McDougall, Lee A.
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): Monroe, James B.
• Application Number:
  US07/049,869
• Time in Patent Office: 342 Days
• Field of Search: 428/402, 428/357, 428/403, 428/407, 428/522, 428/212, 252/8.551, 252/8.552, 252/8.554, 252/8.555, 424/81, 424/419
• US Class Current: 428/402
• CPC Class Codes: C09K 8/54 Compositions for in situ inhibition of corrosion in boreholes or wells
• CPC Class Codes: C09K 8/584 characterised by the use of specific surfactants
• CPC Class Codes: C09K 8/60 Compositions for stimulating production by acting on the underground formation
• CPC Class Codes: E21B 37/06 using chemical means for preventing or limiting , e.g. eliminating, the deposition of paraffins or like substances
• CPC Class Codes: E21B 43/32 Preventing gas- or water-coning phenomena, i.e. the formation of a conical column of gas or water around wells
• CPC Class Codes: Y10S 507/902 Controlled release agent
• CPC Class Codes: Y10S 507/92 Biocidal
• CPC Class Codes: Y10S 507/927 Well cleaning fluid
• CPC Class Codes: Y10S 507/939 Corrosion inhibitor
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/29 Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
• CPC Class Codes: Y10T 428/2982 Particulate matter [e.g., sphere, flake, etc.]
• CPC Class Codes: Y10T 428/2991 Coated
• CPC Class Codes: Y10T 428/2998 including synthetic resin or polymer

Abstract

A solid polymeric body comprising a polymer matrix containing a water-soluble reagent leachable into a fluid containing condensed water, said matrix being reagent permeative and insoluble in said fluid containing condensed water and the said body preferably having a softening point substantially above that of the temperature of the fluid environment in which it is to be employed is useful for the introduction of an additive reagent into said fluid particularly when said fluid is located in a subterranean formation.

Claims

1. A particulate treating material for an environment including water, the particles of the material comprising:

(a) a body composed of a copolymer of

(i) a monomer selected from the group consisting of acrylic acide, acrylamide, acrylonitrile and

(ii) a difunctional hydrophylic comonomer, said body being water-insoluble, having a softening point above said environment, and having structural integrity, internal porosity and a particle size of at least 50 microns and less than 2 millimeters; and

(b) a water soluble reagent disposed in the pores of said body, said reagent constituting at least 5 wt % and not more than 30 wt % based on the combined weights of the body, said reagent being insoluble in the copolymer and being selected from the group consisting of scale inhibitors, corrosion inhibitors, biocides, foamers, and oxygen scavengers, and being leachale therefrom on contact with water, said body retaining its structural integrity without the reagent.

2. The particulate treating material of claim 1 wherein said monomer is acrylamide and said comonomer is a methylene-bis-acrylamide and said water-soluble reagent is diethylenetriamine pentakismethylene phosphonic acid or salts thereof.

3. The particulate treating material of claim 1 wherein the copolymer has a softening point temperature ranging upwards from 30°

C.

4. The particulate treating material of claim 1 wherein said reagent is diethylenetriamine pentakismethylene phosphonic acid or its salt.

5. The particulate treating material of claim 1 wherein the copolymer has a softening point above 60°

C.

6. The particulate treating material of claim 1 wherein said body comprises of a core and an outer shell, said core having a greater reagent permeability than said outer shell.

7. The treating material of claim 1 wherein the monomer is acrylamide and the reagent is a water-soluble amine capable of altering the reactive properties of water.

8. The treating material of claim 1 wherein the scale inhibitors are selected from phosphonates, phosphate esters, inorganic phosphates, and polyacrylic acid;

the surfactants are selected from polyoxyalkylene ether and polyalkylene surfactants;

the corrosion hibitors are selected from amines;

the biocides are selected from 2,2-dibromo-3-nitrilopropionamide, 2-methyl-4-iso-thiazolin-3-one, 5-chloro-2-methyl-4-iso-thiazolin-3-one, dithiocarbamate, and aldehydes;

the foamers are selected from alcohol ether sulfates, sulfonates, ethoxylated polyols, ethoxylated amines, quaternized amines, amine oxides, and ampholytics; and

the oxygen scavengers are selected from sodium bisulfite and hydrazine.